<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap 101 Template</title>

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">

    <script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
    <style>
        .a>*{
            border: 1px solid black;
        }
        .row>*{
            border: 1px solid black;
        }
    </style>
    <![endif]-->
</head>
<body>
<div class="a">
    <div class="row">
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
        <div class="col-md-1">.col-md-1</div>
    </div>
    <div class="row">
        <div class="col-md-8">.col-md-8</div>
        <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
        <div class="col-md-4">.col-md-4</div>
        <div class="col-md-4">.col-md-4</div>
        <div class="col-md-4">.col-md-4</div>
    </div>
    <div class="row">
        <div class="col-md-6">.col-md-6</div>
        <div class="col-md-6">.col-md-6</div>
    </div>
    <!-- Stack the columns on mobile by making one full-width and the other half-width -->
    <div class="row">
        <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>
        <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    </div>

    <!-- Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop -->
    <div class="row">
        <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
        <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
        <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    </div>

    <!-- Columns are always 50% wide, on mobile and desktop -->
    <div class="row">
        <div class="col-xs-6">.col-xs-6</div>
        <div class="col-xs-6">.col-xs-6</div>
    </div>
    <div class="row">
        <div class="col-xs-12 col-sm-6 col-md-8">.col-xs-12 .col-sm-6 .col-md-8</div>
        <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
    </div>
    <div class="row">
        <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
        <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
        <!-- Optional: clear the XS cols if their content doesn't match in height -->
        <div class="clearfix visible-xs-block"></div>
        <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
    </div>
    <div class="row">
        <div class="col-xs-9">.col-xs-9</div>
        <div class="col-xs-4">.col-xs-4<br>Since 9 + 4 = 13 &gt; 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.</div>
        <div class="col-xs-6">.col-xs-6<br>Subsequent columns continue along the new line.</div>
    </div>
    <div class="row">
        <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3  hhhhhhhhhh<br>hhh</div>
        <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>

        <!-- Add the extra clearfix for only the required viewport -->
        <div class="clearfix visible-xs-block"></div>

        <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
        <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
    </div>
    <div class="row">
        <div class="col-sm-5 col-md-6">.col-sm-5 .col-md-6</div>
        <div class="col-sm-5 col-sm-offset-2 col-md-6 col-md-offset-0">.col-sm-5 .col-sm-offset-2 .col-md-6 .col-md-offset-0</div>
    </div>

    <div class="row">
        <div class="col-sm-6 col-md-5 col-lg-6">.col-sm-6 .col-md-5 .col-lg-6</div>
        <div class="col-sm-6 col-md-5 col-md-offset-2 col-lg-6 col-lg-offset-0">.col-sm-6 .col-md-5 .col-md-offset-2 .col-lg-6 .col-lg-offset-0</div>
    </div>
    <div class="row">
        <div class="col-md-4">.col-md-4</div>
        <div class="col-md-4 col-md-offset-4">.col-md-4 .col-md-offset-4</div>
    </div>
    <div class="row">
        <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
        <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
    </div>
    <div class="row">
        <div class="col-md-6 col-md-offset-3">.col-md-6 .col-md-offset-3</div>
    </div>
    <div class="row">
        <div class="col-sm-9">
            Level 1: .col-sm-9
            <div class="row">
                <div class="col-xs-8 col-sm-6">
                    Level 2: .col-xs-8 .col-sm-6
                </div>
                <div class="col-xs-4 col-sm-6">
                    Level 2: .col-xs-4 .col-sm-6
                </div>
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col-md-9 col-md-push-3">.col-md-9 .col-md-push-3</div>
        <div class="col-md-3 col-md-pull-9">.col-md-3 .col-md-pull-9</div>
    </div>
    To switch directories, type <kbd>cd</kbd> followed by the name of the directory.<br>
    To edit settings, press <kbd><kbd>ctrl</kbd> + <kbd>,</kbd></kbd>
</div>

</body>
</html>